Internal combustion engine



Nov. 1.1, 1941. I v M. WARE NTERNAL CO'MBUSTION ENGINE INVENTOR, Marsden (Jara mzaf y M Filed Nov 8, 1939 ATToRNEx/ s dead engine.

Patented Nov. 11,1941

iN'rEnNAI. ooMBUs'rIoN ENGINE Marsden were, Huntington woods, Mich., aa-

sigiior to Packard Motor Car Company, Detroit,

Mich., a corporation of Michigan Application November s, 1939, serial No. 303,343

(o1. sol-.91)

9 Claims.

. This invention relates to fluid heat transfer systems for internal combustion engines.

Power plants for boats and aircraft sometimes include two or more internal combustion engines for driving propellers and such engines are equipped with individual fluid cooling systems.'

Such systems vwhen used with boats employ engine driven pumps for .circulating water to absorb heat from the engine co'oling fluid owing through the radiator,v and some form of thermo; statically controlled shutter mechanism is usually employed with air-cooled radiators of fluid ing system is reduced to such an extent that no' power step-up is retarded by the time required to raise the temperature of the cooling iiuid.

It is the purpose of this invention to assist the starting and/or power increase of an engine in a power plant ofthe type described by an interconnection of the heat transfer systems.

Anotherobject of the invention- .is to provide inter-connected fluid heat transfer systemsfor a plurality of engines in a power plant with means that will automatically control the fl'ow of heatedl fluid from one engine vcooling system to another. A further object of 'the invention isto assist the starting. of a dead engine, or to assist the the rate of engine power increase,`in a power plant of the type referred to, by means whereby 'a portion of the heated cooling fluid flowing from an operating engine will be circulated through a portion of the vcooling system of the 4Other objects of the :invention will lappear from the followingV description'taken in connection with the drawing, which forms -a part of this specification, and in which:

Fig. 1 is -a diagrammatic elevational view of a, I power plant having the invention associated Reierring now tothe drawing, a power plant i is illustrated as comprising two internal combustion lu and ll oi conventional design. Engine lu drives a propeller shaft l2y through means of suitable gearing I3 driven by the.

crankshaft I4 and `engine Il drives a propeller shaft l5 through means of suitable gearing'l driven by' the crankshaft Il. A propeller I8 is,

fixed on shaft l2 and a propeller I9 is xed on shaft l5.

Each engine is provided with` an individual iiuid heat transfer *systeml of conventional design. Each systemincludes .an engine driven pump 2li and a heatv exchanger or radiator 2l. The engines are formed with the usual internal cooling uid cham-hens 50 and conduits 22,connect the outlet end of the chambers with the radlators, the pumps 20 being arranged in such coni duits. Inlet `manifolds for distributing `fluid to the chambers in tle engine are indicated at 23 and conduits 24. lead thereto from the radiators. Thus theL fluid in each system flows in a circuit consisting-of a conduit 22, radiator 2l, conduit 2l, intake manifolds 23 and thechambers 50 'in the engine.

It is ythe purpose of this invention 'to interconnect the cooling` systems of the two enginesso that heated fluid in one 4engine will be utilized to raise the temperature of the other to thus assist starting or power increase. To this end the systems are interconnected preferably by a conduit 25 somewhere between the pumps and the radiators. It is also desirable 'that room be allowed for fluid expansion and for this purpose thehlg'nest pointsor conduits 22 are connected by pipes 26 with a common expansionV tank 2l having a vented closure cap 28. The

conduits 22 are 'provided with one-way valves 29 normally urged toward their seats 3u by springs 3|, these valves being arranged to vprevent back now of lhuid into the pumps.

Fluid from the engine cooling system having the higher pressure will flow through conduit 25 to' conduit 24 of the cooling system of the other engine whereit will now through the radiator and the iiuid intake manifold to the internal chambers because the valve 29 will be closed. The iiiiid will now from the chambers of the ,engine having the lower cooling huid pressure and the conduit 22 connected therewith through the associated 4pipe 2b' to they expansion tank.

' Fluid in the tank will flow baci:v into conduit 22.

llso

.j heated fluid in the engine'having higher cooling fluid pressure is thus by-passed through the other engine and will raise its temperature to nection.

thereby assist in starting or in the rate of power the connecting conduit 25 .is in the form of 'a housing 35 having intersecting chambers in one of which is slidably mounted a piston valve 36. These valves have an open end communicating with the interior of the adjacent conduit 22 and they have radial ports 31 that open to the adjacent housing chamber leading to the conduit 25. Coil springs 38 normally exert pressure against the valves to hold the radial ports in wide open registration with the connecting conduit. Caps 39 can be adjusted to regulate the pressure exerted by the springs and the pressure against each valve is preferably similar or balanced so that the springs oier similar resistance to valve movement. Suitable stop means (not shown) can be employed to limit movement of the valves 36 toward conduits 22 beyond the position shown in Fig. 2.

When one engine has stopped operating, or when both engines are operating at different speeds, there is a pressure difference in the cooling systemsso that fluid will flow through conduit 25 from the higher pressure system to the 2. In a power plant, the combinationv with fluid heat transfer systems for a pair of engines, of a connection between said systems, and

pressure actuated valve means in said connection automatically regulating fluid flow therethrough.

3. In a heat transfer system, the combination with a pair of engine cooling fluid circuits each having a pump and a radiator, of a conduit connecting the circuits between the pumps and radiators, and a non-return valve means in the circuits between said conduit and said pumps.

4. In a heat transfer system, the combination with a pair of engine cooling fluid circuits, of means interconnecting said circuits through which uid can flow from one circuit to the other, and means in said interconnecting means regulating the direction and rate 4of fluid ow therethrough.

5. In a heat transfer .system for a pair of engines, a fluid cooling circuit for each engine in cluding a, radiator and a pump for moving the fluid through the radiator, a fluid connection between the circuits adjacent the outlets from the engines, an interconnection between the circuits between Athe radiators and the pumps, and

lower pressure system. Pressure in the cooling systems varies in accordance with engine speed and the valves 36- respond to such pressures to control the diversion of fluid from the higher pressure system when there is a difference in the iluid pressure in the cooling systems. The valves are mainly usefulwhen one engine has stopped or is operating very slowly in comparison with the other engine because without restriction, diversion of -fluid from the higher pressure system would be too great especially during higher engine speeds. n

The system is also equipped with emergency control means in the event the automatic means fails or a further restriction through the interconnection is desired. Such means consists of hand actuated valves 60 in the conduit between the pressure valves and hand operated valves 5| in the pipes 26.

Although the invention has been described in connection with a'specic embodiment, the principles involved are susceptible of numerous other applications which will readily occur to persons skilled in the art. 'I'he invention is therefore to be limited only as indicated by the Ascope of the appended claims.

What is claimed is: i

1. In a power plant, the combination with circulatory fluid heat transfer systems for a pair of engines, of a connection between said systems for diverting a portion of the heated fluid in either system to the other system, and means controlling the ilow of iluid through said connecting the circuitsadjacent the engine fluid a one-way valve in each circuit between th pump and the interconnection.

6. In a, heat transfer system for a pair of en gines, of fluid cooling circuit for each engine including a radiator and apump for moving fluid through the radiator, an expansion chamber connecting the circuits adjacent the uid outlet of the engines, a one-way valve in each circuit adjacent the pump, a connection for the circuits between the valves and the radiators, and balanced pressure operated valves inthe connection.

7. In a heattransfer system for a pair of engines, a fluid cooling circuit for each engine including a radiator and a pump for moving uid through the radiator, an expansion tank conoutlets, valve means operable to shut on the tank from the circuits, a one-way valve in each system adjacent the pump outlets, means connecting the circuits between the one-way valves and the radiators, and valve means in the connecting means-operable to shut olf flow therethrough.

8.-.In a heat transfer vsystem for a pair of engines, a fluid cooling circuit for each engine including ,a heat exchanger, an engine chamber and a pump intermediate the chamber and the heat exchanger; conduit means connecting the portions of the circuits between the pumps and the heat exchangers; and means operating automatically to control the quantity of fluid flow through the conduit means.

9. In a heat transfersystem" for a pair of engines, a' uid cooling circuit for each engine ,comprising an .enginel heat transfer chamber connected with a heat exchanger, conduit means interconnecting interior portions of said circuits, and pressure responsive means automatically regulating fluid now through the interconnecting means so that the temperature of fthe fluid in the colder circuit will be raised.

MARSDEN WARE. 

